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skia/skia/be8c19e8d3deac9b9585c44b9a423912dd00a75a/./src/pdf/SkPDFDevice.cpp
blob: 0e11f617084b8052bb4c302ad62ad2e434c90bd8 [file]
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPDFDevice.h"
#include "SkAnnotation.h"
#include "SkColor.h"
#include "SkColorFilter.h"
#include "SkClipStack.h"
#include "SkData.h"
#include "SkDraw.h"
#include "SkGlyphCache.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkPathOps.h"
#include "SkPDFBitmap.h"
#include "SkPDFCanon.h"
#include "SkPDFFont.h"
#include "SkPDFFormXObject.h"
#include "SkPDFGraphicState.h"
#include "SkPDFResourceDict.h"
#include "SkPDFShader.h"
#include "SkPDFStream.h"
#include "SkPDFTypes.h"
#include "SkPDFUtils.h"
#include "SkRasterClip.h"
#include "SkRect.h"
#include "SkRRect.h"
#include "SkString.h"
#include "SkSurface.h"
#include "SkTextFormatParams.h"
#include "SkTemplates.h"
#include "SkTypefacePriv.h"
#include "SkXfermodeInterpretation.h"
#define DPI_FOR_RASTER_SCALE_ONE 72
// Utility functions
// If the paint will definitely draw opaquely, replace kSrc_Mode with
// kSrcOver_Mode. http://crbug.com/473572
static void replace_srcmode_on_opaque_paint(SkPaint* paint) {
if (kSrcOver_SkXfermodeInterpretation
== SkInterpretXfermode(*paint, false)) {
paint->setXfermode(nullptr);
}
}
static void emit_pdf_color(SkColor color, SkWStream* result) {
SkASSERT(SkColorGetA(color) == 0xFF); // We handle alpha elsewhere.
SkScalar colorScale = SkScalarInvert(0xFF);
SkPDFUtils::AppendScalar(SkColorGetR(color) * colorScale, result);
result->writeText(" ");
SkPDFUtils::AppendScalar(SkColorGetG(color) * colorScale, result);
result->writeText(" ");
SkPDFUtils::AppendScalar(SkColorGetB(color) * colorScale, result);
result->writeText(" ");
}
static SkPaint calculate_text_paint(const SkPaint& paint) {
SkPaint result = paint;
if (result.isFakeBoldText()) {
SkScalar fakeBoldScale = SkScalarInterpFunc(result.getTextSize(),
kStdFakeBoldInterpKeys,
kStdFakeBoldInterpValues,
kStdFakeBoldInterpLength);
SkScalar width = SkScalarMul(result.getTextSize(), fakeBoldScale);
if (result.getStyle() == SkPaint::kFill_Style) {
result.setStyle(SkPaint::kStrokeAndFill_Style);
} else {
width += result.getStrokeWidth();
}
result.setStrokeWidth(width);
}
return result;
}
// Stolen from measure_text in SkDraw.cpp and then tweaked.
static void align_text(SkDrawCacheProc glyphCacheProc, const SkPaint& paint,
const uint16_t* glyphs, size_t len,
SkScalar* x, SkScalar* y) {
if (paint.getTextAlign() == SkPaint::kLeft_Align) {
return;
}
SkMatrix ident;
ident.reset();
SkAutoGlyphCache autoCache(paint, nullptr, &ident);
SkGlyphCache* cache = autoCache.getCache();
const char* start = reinterpret_cast<const char*>(glyphs);
const char* stop = reinterpret_cast<const char*>(glyphs + len);
SkFixed xAdv = 0, yAdv = 0;
// TODO(vandebo): This probably needs to take kerning into account.
while (start < stop) {
const SkGlyph& glyph = glyphCacheProc(cache, &start, 0, 0);
xAdv += glyph.fAdvanceX;
yAdv += glyph.fAdvanceY;
};
if (paint.getTextAlign() == SkPaint::kLeft_Align) {
return;
}
SkScalar xAdj = SkFixedToScalar(xAdv);
SkScalar yAdj = SkFixedToScalar(yAdv);
if (paint.getTextAlign() == SkPaint::kCenter_Align) {
xAdj = SkScalarHalf(xAdj);
yAdj = SkScalarHalf(yAdj);
}
*x = *x - xAdj;
*y = *y - yAdj;
}
static int max_glyphid_for_typeface(SkTypeface* typeface) {
SkAutoResolveDefaultTypeface autoResolve(typeface);
typeface = autoResolve.get();
return typeface->countGlyphs() - 1;
}
typedef SkAutoSTMalloc<128, uint16_t> SkGlyphStorage;
static int force_glyph_encoding(const SkPaint& paint, const void* text,
size_t len, SkGlyphStorage* storage,
const uint16_t** glyphIDs) {
// Make sure we have a glyph id encoding.
if (paint.getTextEncoding() != SkPaint::kGlyphID_TextEncoding) {
int numGlyphs = paint.textToGlyphs(text, len, nullptr);
storage->reset(numGlyphs);
paint.textToGlyphs(text, len, storage->get());
*glyphIDs = storage->get();
return numGlyphs;
}
// For user supplied glyph ids we need to validate them.
SkASSERT((len & 1) == 0);
int numGlyphs = SkToInt(len / 2);
const uint16_t* input = static_cast<const uint16_t*>(text);
int maxGlyphID = max_glyphid_for_typeface(paint.getTypeface());
int validated;
for (validated = 0; validated < numGlyphs; ++validated) {
if (input[validated] > maxGlyphID) {
break;
}
}
if (validated >= numGlyphs) {
*glyphIDs = static_cast<const uint16_t*>(text);
return numGlyphs;
}
// Silently drop anything out of range.
storage->reset(numGlyphs);
if (validated > 0) {
memcpy(storage->get(), input, validated * sizeof(uint16_t));
}
for (int i = validated; i < numGlyphs; ++i) {
storage->get()[i] = input[i];
if (input[i] > maxGlyphID) {
storage->get()[i] = 0;
}
}
*glyphIDs = storage->get();
return numGlyphs;
}
static void set_text_transform(SkScalar x, SkScalar y, SkScalar textSkewX,
SkWStream* content) {
// Flip the text about the x-axis to account for origin swap and include
// the passed parameters.
content->writeText("1 0 ");
SkPDFUtils::AppendScalar(0 - textSkewX, content);
content->writeText(" -1 ");
SkPDFUtils::AppendScalar(x, content);
content->writeText(" ");
SkPDFUtils::AppendScalar(y, content);
content->writeText(" Tm\n");
}
// It is important to not confuse GraphicStateEntry with SkPDFGraphicState, the
// later being our representation of an object in the PDF file.
struct GraphicStateEntry {
GraphicStateEntry();
// Compare the fields we care about when setting up a new content entry.
bool compareInitialState(const GraphicStateEntry& b);
SkMatrix fMatrix;
// We can't do set operations on Paths, though PDF natively supports
// intersect. If the clip stack does anything other than intersect,
// we have to fall back to the region. Treat fClipStack as authoritative.
// See http://code.google.com/p/skia/issues/detail?id=221
SkClipStack fClipStack;
SkRegion fClipRegion;
// When emitting the content entry, we will ensure the graphic state
// is set to these values first.
SkColor fColor;
SkScalar fTextScaleX; // Zero means we don't care what the value is.
SkPaint::Style fTextFill; // Only if TextScaleX is non-zero.
int fShaderIndex;
int fGraphicStateIndex;
// We may change the font (i.e. for Type1 support) within a
// ContentEntry. This is the one currently in effect, or nullptr if none.
SkPDFFont* fFont;
// In PDF, text size has no default value. It is only valid if fFont is
// not nullptr.
SkScalar fTextSize;
};
GraphicStateEntry::GraphicStateEntry() : fColor(SK_ColorBLACK),
fTextScaleX(SK_Scalar1),
fTextFill(SkPaint::kFill_Style),
fShaderIndex(-1),
fGraphicStateIndex(-1),
fFont(nullptr),
fTextSize(SK_ScalarNaN) {
fMatrix.reset();
}
bool GraphicStateEntry::compareInitialState(const GraphicStateEntry& cur) {
return fColor == cur.fColor &&
fShaderIndex == cur.fShaderIndex &&
fGraphicStateIndex == cur.fGraphicStateIndex &&
fMatrix == cur.fMatrix &&
fClipStack == cur.fClipStack &&
(fTextScaleX == 0 ||
(fTextScaleX == cur.fTextScaleX && fTextFill == cur.fTextFill));
}
class GraphicStackState {
public:
GraphicStackState(const SkClipStack& existingClipStack,
const SkRegion& existingClipRegion,
SkWStream* contentStream)
: fStackDepth(0),
fContentStream(contentStream) {
fEntries[0].fClipStack = existingClipStack;
fEntries[0].fClipRegion = existingClipRegion;
}
void updateClip(const SkClipStack& clipStack, const SkRegion& clipRegion,
const SkPoint& translation);
void updateMatrix(const SkMatrix& matrix);
void updateDrawingState(const GraphicStateEntry& state);
void drainStack();
private:
void push();
void pop();
GraphicStateEntry* currentEntry() { return &fEntries[fStackDepth]; }
// Conservative limit on save depth, see impl. notes in PDF 1.4 spec.
static const int kMaxStackDepth = 12;
GraphicStateEntry fEntries[kMaxStackDepth + 1];
int fStackDepth;
SkWStream* fContentStream;
};
void GraphicStackState::drainStack() {
while (fStackDepth) {
pop();
}
}
void GraphicStackState::push() {
SkASSERT(fStackDepth < kMaxStackDepth);
fContentStream->writeText("q\n");
fStackDepth++;
fEntries[fStackDepth] = fEntries[fStackDepth - 1];
}
void GraphicStackState::pop() {
SkASSERT(fStackDepth > 0);
fContentStream->writeText("Q\n");
fStackDepth--;
}
// This function initializes iter to be an iterator on the "stack" argument
// and then skips over the leading entries as specified in prefix. It requires
// and asserts that "prefix" will be a prefix to "stack."
static void skip_clip_stack_prefix(const SkClipStack& prefix,
const SkClipStack& stack,
SkClipStack::Iter* iter) {
SkClipStack::B2TIter prefixIter(prefix);
iter->reset(stack, SkClipStack::Iter::kBottom_IterStart);
const SkClipStack::Element* prefixEntry;
const SkClipStack::Element* iterEntry;
for (prefixEntry = prefixIter.next(); prefixEntry;
prefixEntry = prefixIter.next()) {
iterEntry = iter->next();
SkASSERT(iterEntry);
// Because of SkClipStack does internal intersection, the last clip
// entry may differ.
if (*prefixEntry != *iterEntry) {
SkASSERT(prefixEntry->getOp() == SkRegion::kIntersect_Op);
SkASSERT(iterEntry->getOp() == SkRegion::kIntersect_Op);
SkASSERT(iterEntry->getType() == prefixEntry->getType());
// back up the iterator by one
iter->prev();
prefixEntry = prefixIter.next();
break;
}
}
SkASSERT(prefixEntry == nullptr);
}
static void emit_clip(SkPath* clipPath, SkRect* clipRect,
SkWStream* contentStream) {
SkASSERT(clipPath || clipRect);
SkPath::FillType clipFill;
if (clipPath) {
SkPDFUtils::EmitPath(*clipPath, SkPaint::kFill_Style, contentStream);
clipFill = clipPath->getFillType();
} else {
SkPDFUtils::AppendRectangle(*clipRect, contentStream);
clipFill = SkPath::kWinding_FillType;
}
NOT_IMPLEMENTED(clipFill == SkPath::kInverseEvenOdd_FillType, false);
NOT_IMPLEMENTED(clipFill == SkPath::kInverseWinding_FillType, false);
if (clipFill == SkPath::kEvenOdd_FillType) {
contentStream->writeText("W* n\n");
} else {
contentStream->writeText("W n\n");
}
}
/* Calculate an inverted path's equivalent non-inverted path, given the
* canvas bounds.
* outPath may alias with invPath (since this is supported by PathOps).
*/
static bool calculate_inverse_path(const SkRect& bounds, const SkPath& invPath,
SkPath* outPath) {
SkASSERT(invPath.isInverseFillType());
SkPath clipPath;
clipPath.addRect(bounds);
return Op(clipPath, invPath, kIntersect_SkPathOp, outPath);
}
#ifdef SK_PDF_USE_PATHOPS_CLIPPING
// Sanity check the numerical values of the SkRegion ops and PathOps ops
// enums so region_op_to_pathops_op can do a straight passthrough cast.
// If these are failing, it may be necessary to make region_op_to_pathops_op
// do more.
static_assert(SkRegion::kDifference_Op == (int)kDifference_SkPathOp, "region_pathop_mismatch");
static_assert(SkRegion::kIntersect_Op == (int)kIntersect_SkPathOp, "region_pathop_mismatch");
static_assert(SkRegion::kUnion_Op == (int)kUnion_SkPathOp, "region_pathop_mismatch");
static_assert(SkRegion::kXOR_Op == (int)kXOR_SkPathOp, "region_pathop_mismatch");
static_assert(SkRegion::kReverseDifference_Op == (int)kReverseDifference_SkPathOp,
"region_pathop_mismatch");
static SkPathOp region_op_to_pathops_op(SkRegion::Op op) {
SkASSERT(op >= 0);
SkASSERT(op <= SkRegion::kReverseDifference_Op);
return (SkPathOp)op;
}
/* Uses Path Ops to calculate a vector SkPath clip from a clip stack.
* Returns true if successful, or false if not successful.
* If successful, the resulting clip is stored in outClipPath.
* If not successful, outClipPath is undefined, and a fallback method
* should be used.
*/
static bool get_clip_stack_path(const SkMatrix& transform,
const SkClipStack& clipStack,
const SkRegion& clipRegion,
SkPath* outClipPath) {
outClipPath->reset();
outClipPath->setFillType(SkPath::kInverseWinding_FillType);
const SkClipStack::Element* clipEntry;
SkClipStack::Iter iter;
iter.reset(clipStack, SkClipStack::Iter::kBottom_IterStart);
for (clipEntry = iter.next(); clipEntry; clipEntry = iter.next()) {
SkPath entryPath;
if (SkClipStack::Element::kEmpty_Type == clipEntry->getType()) {
outClipPath->reset();
outClipPath->setFillType(SkPath::kInverseWinding_FillType);
continue;
} else {
clipEntry->asPath(&entryPath);
}
entryPath.transform(transform);
if (SkRegion::kReplace_Op == clipEntry->getOp()) {
*outClipPath = entryPath;
} else {
SkPathOp op = region_op_to_pathops_op(clipEntry->getOp());
if (!Op(*outClipPath, entryPath, op, outClipPath)) {
return false;
}
}
}
if (outClipPath->isInverseFillType()) {
// The bounds are slightly outset to ensure this is correct in the
// face of floating-point accuracy and possible SkRegion bitmap
// approximations.
SkRect clipBounds = SkRect::Make(clipRegion.getBounds());
clipBounds.outset(SK_Scalar1, SK_Scalar1);
if (!calculate_inverse_path(clipBounds, *outClipPath, outClipPath)) {
return false;
}
}
return true;
}
#endif
// TODO(vandebo): Take advantage of SkClipStack::getSaveCount(), the PDF
// graphic state stack, and the fact that we can know all the clips used
// on the page to optimize this.
void GraphicStackState::updateClip(const SkClipStack& clipStack,
const SkRegion& clipRegion,
const SkPoint& translation) {
if (clipStack == currentEntry()->fClipStack) {
return;
}
while (fStackDepth > 0) {
pop();
if (clipStack == currentEntry()->fClipStack) {
return;
}
}
push();
currentEntry()->fClipStack = clipStack;
currentEntry()->fClipRegion = clipRegion;
SkMatrix transform;
transform.setTranslate(translation.fX, translation.fY);
#ifdef SK_PDF_USE_PATHOPS_CLIPPING
SkPath clipPath;
if (get_clip_stack_path(transform, clipStack, clipRegion, &clipPath)) {
emit_clip(&clipPath, nullptr, fContentStream);
return;
}
#endif
// gsState->initialEntry()->fClipStack/Region specifies the clip that has
// already been applied. (If this is a top level device, then it specifies
// a clip to the content area. If this is a layer, then it specifies
// the clip in effect when the layer was created.) There's no need to
// reapply that clip; SKCanvas's SkDrawIter will draw anything outside the
// initial clip on the parent layer. (This means there's a bug if the user
// expands the clip and then uses any xfer mode that uses dst:
// http://code.google.com/p/skia/issues/detail?id=228 )
SkClipStack::Iter iter;
skip_clip_stack_prefix(fEntries[0].fClipStack, clipStack, &iter);
// If the clip stack does anything other than intersect or if it uses
// an inverse fill type, we have to fall back to the clip region.
bool needRegion = false;
const SkClipStack::Element* clipEntry;
for (clipEntry = iter.next(); clipEntry; clipEntry = iter.next()) {
if (clipEntry->getOp() != SkRegion::kIntersect_Op ||
clipEntry->isInverseFilled()) {
needRegion = true;
break;
}
}
if (needRegion) {
SkPath clipPath;
SkAssertResult(clipRegion.getBoundaryPath(&clipPath));
emit_clip(&clipPath, nullptr, fContentStream);
} else {
skip_clip_stack_prefix(fEntries[0].fClipStack, clipStack, &iter);
const SkClipStack::Element* clipEntry;
for (clipEntry = iter.next(); clipEntry; clipEntry = iter.next()) {
SkASSERT(clipEntry->getOp() == SkRegion::kIntersect_Op);
switch (clipEntry->getType()) {
case SkClipStack::Element::kRect_Type: {
SkRect translatedClip;
transform.mapRect(&translatedClip, clipEntry->getRect());
emit_clip(nullptr, &translatedClip, fContentStream);
break;
}
default: {
SkPath translatedPath;
clipEntry->asPath(&translatedPath);
translatedPath.transform(transform, &translatedPath);
emit_clip(&translatedPath, nullptr, fContentStream);
break;
}
}
}
}
}
void GraphicStackState::updateMatrix(const SkMatrix& matrix) {
if (matrix == currentEntry()->fMatrix) {
return;
}
if (currentEntry()->fMatrix.getType() != SkMatrix::kIdentity_Mask) {
SkASSERT(fStackDepth > 0);
SkASSERT(fEntries[fStackDepth].fClipStack ==
fEntries[fStackDepth -1].fClipStack);
pop();
SkASSERT(currentEntry()->fMatrix.getType() == SkMatrix::kIdentity_Mask);
}
if (matrix.getType() == SkMatrix::kIdentity_Mask) {
return;
}
push();
SkPDFUtils::AppendTransform(matrix, fContentStream);
currentEntry()->fMatrix = matrix;
}
void GraphicStackState::updateDrawingState(const GraphicStateEntry& state) {
// PDF treats a shader as a color, so we only set one or the other.
if (state.fShaderIndex >= 0) {
if (state.fShaderIndex != currentEntry()->fShaderIndex) {
SkPDFUtils::ApplyPattern(state.fShaderIndex, fContentStream);
currentEntry()->fShaderIndex = state.fShaderIndex;
}
} else {
if (state.fColor != currentEntry()->fColor ||
currentEntry()->fShaderIndex >= 0) {
emit_pdf_color(state.fColor, fContentStream);
fContentStream->writeText("RG ");
emit_pdf_color(state.fColor, fContentStream);
fContentStream->writeText("rg\n");
currentEntry()->fColor = state.fColor;
currentEntry()->fShaderIndex = -1;
}
}
if (state.fGraphicStateIndex != currentEntry()->fGraphicStateIndex) {
SkPDFUtils::ApplyGraphicState(state.fGraphicStateIndex, fContentStream);
currentEntry()->fGraphicStateIndex = state.fGraphicStateIndex;
}
if (state.fTextScaleX) {
if (state.fTextScaleX != currentEntry()->fTextScaleX) {
SkScalar pdfScale = SkScalarMul(state.fTextScaleX,
SkIntToScalar(100));
SkPDFUtils::AppendScalar(pdfScale, fContentStream);
fContentStream->writeText(" Tz\n");
currentEntry()->fTextScaleX = state.fTextScaleX;
}
if (state.fTextFill != currentEntry()->fTextFill) {
static_assert(SkPaint::kFill_Style == 0, "enum_must_match_value");
static_assert(SkPaint::kStroke_Style == 1, "enum_must_match_value");
static_assert(SkPaint::kStrokeAndFill_Style == 2, "enum_must_match_value");
fContentStream->writeDecAsText(state.fTextFill);
fContentStream->writeText(" Tr\n");
currentEntry()->fTextFill = state.fTextFill;
}
}
}
static bool not_supported_for_layers(const SkPaint& layerPaint) {
// PDF does not support image filters, so render them on CPU.
// Note that this rendering is done at "screen" resolution (100dpi), not
// printer resolution.
// TODO: It may be possible to express some filters natively using PDF
// to improve quality and file size (https://bug.skia.org/3043)
// TODO: should we return true if there is a colorfilter?
return layerPaint.getImageFilter() != nullptr;
}
SkBaseDevice* SkPDFDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint* layerPaint) {
if (cinfo.fForImageFilter ||
(layerPaint && not_supported_for_layers(*layerPaint))) {
return nullptr;
}
SkISize size = SkISize::Make(cinfo.fInfo.width(), cinfo.fInfo.height());
return SkPDFDevice::Create(size, fRasterDpi, fCanon);
}
struct ContentEntry {
GraphicStateEntry fState;
SkDynamicMemoryWStream fContent;
SkAutoTDelete<ContentEntry> fNext;
// If the stack is too deep we could get Stack Overflow.
// So we manually destruct the object.
~ContentEntry() {
ContentEntry* val = fNext.detach();
while (val != nullptr) {
ContentEntry* valNext = val->fNext.detach();
// When the destructor is called, fNext is nullptr and exits.
delete val;
val = valNext;
}
}
};
// A helper class to automatically finish a ContentEntry at the end of a
// drawing method and maintain the state needed between set up and finish.
class ScopedContentEntry {
public:
ScopedContentEntry(SkPDFDevice* device, const SkDraw& draw,
const SkPaint& paint, bool hasText = false)
: fDevice(device),
fContentEntry(nullptr),
fXfermode(SkXfermode::kSrcOver_Mode),
fDstFormXObject(nullptr) {
init(draw.fClipStack, *draw.fClip, *draw.fMatrix, paint, hasText);
}
ScopedContentEntry(SkPDFDevice* device, const SkClipStack* clipStack,
const SkRegion& clipRegion, const SkMatrix& matrix,
const SkPaint& paint, bool hasText = false)
: fDevice(device),
fContentEntry(nullptr),
fXfermode(SkXfermode::kSrcOver_Mode),
fDstFormXObject(nullptr) {
init(clipStack, clipRegion, matrix, paint, hasText);
}
~ScopedContentEntry() {
if (fContentEntry) {
SkPath* shape = &fShape;
if (shape->isEmpty()) {
shape = nullptr;
}
fDevice->finishContentEntry(fXfermode, fDstFormXObject, shape);
}
SkSafeUnref(fDstFormXObject);
}
ContentEntry* entry() { return fContentEntry; }
/* Returns true when we explicitly need the shape of the drawing. */
bool needShape() {
switch (fXfermode) {
case SkXfermode::kClear_Mode:
case SkXfermode::kSrc_Mode:
case SkXfermode::kSrcIn_Mode:
case SkXfermode::kSrcOut_Mode:
case SkXfermode::kDstIn_Mode:
case SkXfermode::kDstOut_Mode:
case SkXfermode::kSrcATop_Mode:
case SkXfermode::kDstATop_Mode:
case SkXfermode::kModulate_Mode:
return true;
default:
return false;
}
}
/* Returns true unless we only need the shape of the drawing. */
bool needSource() {
if (fXfermode == SkXfermode::kClear_Mode) {
return false;
}
return true;
}
/* If the shape is different than the alpha component of the content, then
* setShape should be called with the shape. In particular, images and
* devices have rectangular shape.
*/
void setShape(const SkPath& shape) {
fShape = shape;
}
private:
SkPDFDevice* fDevice;
ContentEntry* fContentEntry;
SkXfermode::Mode fXfermode;
SkPDFFormXObject* fDstFormXObject;
SkPath fShape;
void init(const SkClipStack* clipStack, const SkRegion& clipRegion,
const SkMatrix& matrix, const SkPaint& paint, bool hasText) {
// Shape has to be flatten before we get here.
if (matrix.hasPerspective()) {
NOT_IMPLEMENTED(!matrix.hasPerspective(), false);
return;
}
if (paint.getXfermode()) {
paint.getXfermode()->asMode(&fXfermode);
}
fContentEntry = fDevice->setUpContentEntry(clipStack, clipRegion,
matrix, paint, hasText,
&fDstFormXObject);
}
};
////////////////////////////////////////////////////////////////////////////////
SkPDFDevice::SkPDFDevice(SkISize pageSize, SkScalar rasterDpi, SkPDFCanon* canon, bool flip)
: INHERITED(SkSurfaceProps(0, kUnknown_SkPixelGeometry))
, fPageSize(pageSize)
, fContentSize(pageSize)
, fExistingClipRegion(SkIRect::MakeSize(pageSize))
, fLastContentEntry(nullptr)
, fLastMarginContentEntry(nullptr)
, fDrawingArea(kContent_DrawingArea)
, fClipStack(nullptr)
, fFontGlyphUsage(new SkPDFGlyphSetMap)
, fRasterDpi(rasterDpi)
, fCanon(canon) {
SkASSERT(pageSize.width() > 0);
SkASSERT(pageSize.height() > 0);
fLegacyBitmap.setInfo(
SkImageInfo::MakeUnknown(pageSize.width(), pageSize.height()));
if (flip) {
// Skia generally uses the top left as the origin but PDF
// natively has the origin at the bottom left. This matrix
// corrects for that. But that only needs to be done once, we
// don't do it when layering.
fInitialTransform.setTranslate(0, SkIntToScalar(pageSize.fHeight));
fInitialTransform.preScale(SK_Scalar1, -SK_Scalar1);
} else {
fInitialTransform.setIdentity();
}
}
SkPDFDevice::~SkPDFDevice() {
this->cleanUp(true);
}
void SkPDFDevice::init() {
fContentEntries.free();
fLastContentEntry = nullptr;
fMarginContentEntries.free();
fLastMarginContentEntry = nullptr;
fDrawingArea = kContent_DrawingArea;
if (fFontGlyphUsage.get() == nullptr) {
fFontGlyphUsage.reset(new SkPDFGlyphSetMap);
}
}
void SkPDFDevice::cleanUp(bool clearFontUsage) {
fGraphicStateResources.unrefAll();
fXObjectResources.unrefAll();
fFontResources.unrefAll();
fShaderResources.unrefAll();
fLinkToURLs.deleteAll();
fLinkToDestinations.deleteAll();
fNamedDestinations.deleteAll();
if (clearFontUsage) {
fFontGlyphUsage->reset();
}
}
void SkPDFDevice::drawPaint(const SkDraw& d, const SkPaint& paint) {
SkPaint newPaint = paint;
replace_srcmode_on_opaque_paint(&newPaint);
newPaint.setStyle(SkPaint::kFill_Style);
ScopedContentEntry content(this, d, newPaint);
internalDrawPaint(newPaint, content.entry());
}
void SkPDFDevice::internalDrawPaint(const SkPaint& paint,
ContentEntry* contentEntry) {
if (!contentEntry) {
return;
}
SkRect bbox = SkRect::MakeWH(SkIntToScalar(this->width()),
SkIntToScalar(this->height()));
SkMatrix inverse;
if (!contentEntry->fState.fMatrix.invert(&inverse)) {
return;
}
inverse.mapRect(&bbox);
SkPDFUtils::AppendRectangle(bbox, &contentEntry->fContent);
SkPDFUtils::PaintPath(paint.getStyle(), SkPath::kWinding_FillType,
&contentEntry->fContent);
}
void SkPDFDevice::drawPoints(const SkDraw& d,
SkCanvas::PointMode mode,
size_t count,
const SkPoint* points,
const SkPaint& srcPaint) {
SkPaint passedPaint = srcPaint;
replace_srcmode_on_opaque_paint(&passedPaint);
if (count == 0) {
return;
}
if (SkAnnotation* annotation = passedPaint.getAnnotation()) {
if (handlePointAnnotation(points, count, *d.fMatrix, annotation)) {
return;
}
}
// SkDraw::drawPoints converts to multiple calls to fDevice->drawPath.
// We only use this when there's a path effect because of the overhead
// of multiple calls to setUpContentEntry it causes.
if (passedPaint.getPathEffect()) {
if (d.fClip->isEmpty()) {
return;
}
SkDraw pointDraw(d);
pointDraw.fDevice = this;
pointDraw.drawPoints(mode, count, points, passedPaint, true);
return;
}
const SkPaint* paint = &passedPaint;
SkPaint modifiedPaint;
if (mode == SkCanvas::kPoints_PointMode &&
paint->getStrokeCap() != SkPaint::kRound_Cap) {
modifiedPaint = *paint;
paint = &modifiedPaint;
if (paint->getStrokeWidth()) {
// PDF won't draw a single point with square/butt caps because the
// orientation is ambiguous. Draw a rectangle instead.
modifiedPaint.setStyle(SkPaint::kFill_Style);
SkScalar strokeWidth = paint->getStrokeWidth();
SkScalar halfStroke = SkScalarHalf(strokeWidth);
for (size_t i = 0; i < count; i++) {
SkRect r = SkRect::MakeXYWH(points[i].fX, points[i].fY, 0, 0);
r.inset(-halfStroke, -halfStroke);
drawRect(d, r, modifiedPaint);
}
return;
} else {
modifiedPaint.setStrokeCap(SkPaint::kRound_Cap);
}
}
ScopedContentEntry content(this, d, *paint);
if (!content.entry()) {
return;
}
switch (mode) {
case SkCanvas::kPolygon_PointMode:
SkPDFUtils::MoveTo(points[0].fX, points[0].fY,
&content.entry()->fContent);
for (size_t i = 1; i < count; i++) {
SkPDFUtils::AppendLine(points[i].fX, points[i].fY,
&content.entry()->fContent);
}
SkPDFUtils::StrokePath(&content.entry()->fContent);
break;
case SkCanvas::kLines_PointMode:
for (size_t i = 0; i < count/2; i++) {
SkPDFUtils::MoveTo(points[i * 2].fX, points[i * 2].fY,
&content.entry()->fContent);
SkPDFUtils::AppendLine(points[i * 2 + 1].fX,
points[i * 2 + 1].fY,
&content.entry()->fContent);
SkPDFUtils::StrokePath(&content.entry()->fContent);
}
break;
case SkCanvas::kPoints_PointMode:
SkASSERT(paint->getStrokeCap() == SkPaint::kRound_Cap);
for (size_t i = 0; i < count; i++) {
SkPDFUtils::MoveTo(points[i].fX, points[i].fY,
&content.entry()->fContent);
SkPDFUtils::ClosePath(&content.entry()->fContent);
SkPDFUtils::StrokePath(&content.entry()->fContent);
}
break;
default:
SkASSERT(false);
}
}
static SkPDFDict* create_link_annotation(const SkRect& translatedRect) {
SkAutoTUnref<SkPDFDict> annotation(new SkPDFDict("Annot"));
annotation->insertName("Subtype", "Link");
SkAutoTUnref<SkPDFArray> border(new SkPDFArray);
border->reserve(3);
border->appendInt(0); // Horizontal corner radius.
border->appendInt(0); // Vertical corner radius.
border->appendInt(0); // Width, 0 = no border.
annotation->insertObject("Border", border.detach());
SkAutoTUnref<SkPDFArray> rect(new SkPDFArray);
rect->reserve(4);
rect->appendScalar(translatedRect.fLeft);
rect->appendScalar(translatedRect.fTop);
rect->appendScalar(translatedRect.fRight);
rect->appendScalar(translatedRect.fBottom);
annotation->insertObject("Rect", rect.detach());
return annotation.detach();
}
static SkPDFDict* create_link_to_url(const SkData* urlData, const SkRect& r) {
SkAutoTUnref<SkPDFDict> annotation(create_link_annotation(r));
SkString url(static_cast<const char *>(urlData->data()),
urlData->size() - 1);
SkAutoTUnref<SkPDFDict> action(new SkPDFDict("Action"));
action->insertName("S", "URI");
action->insertString("URI", url);
annotation->insertObject("A", action.detach());
return annotation.detach();
}
static SkPDFDict* create_link_named_dest(const SkData* nameData,
const SkRect& r) {
SkAutoTUnref<SkPDFDict> annotation(create_link_annotation(r));
SkString name(static_cast<const char *>(nameData->data()),
nameData->size() - 1);
annotation->insertName("Dest", name);
return annotation.detach();
}
void SkPDFDevice::drawRect(const SkDraw& d,
const SkRect& rect,
const SkPaint& srcPaint) {
SkPaint paint = srcPaint;
replace_srcmode_on_opaque_paint(&paint);
SkRect r = rect;
r.sort();
if (paint.getPathEffect()) {
if (d.fClip->isEmpty()) {
return;
}
SkPath path;
path.addRect(r);
drawPath(d, path, paint, nullptr, true);
return;
}
if (SkAnnotation* annotation = paint.getAnnotation()) {
SkPath path;
path.addRect(rect);
if (handlePathAnnotation(path, d, annotation)) {
return;
}
}
ScopedContentEntry content(this, d, paint);
if (!content.entry()) {
return;
}
SkPDFUtils::AppendRectangle(r, &content.entry()->fContent);
SkPDFUtils::PaintPath(paint.getStyle(), SkPath::kWinding_FillType,
&content.entry()->fContent);
}
void SkPDFDevice::drawRRect(const SkDraw& draw,
const SkRRect& rrect,
const SkPaint& srcPaint) {
SkPaint paint = srcPaint;
replace_srcmode_on_opaque_paint(&paint);
SkPath path;
path.addRRect(rrect);
this->drawPath(draw, path, paint, nullptr, true);
}
void SkPDFDevice::drawOval(const SkDraw& draw,
const SkRect& oval,
const SkPaint& srcPaint) {
SkPaint paint = srcPaint;
replace_srcmode_on_opaque_paint(&paint);
SkPath path;
path.addOval(oval);
this->drawPath(draw, path, paint, nullptr, true);
}
void SkPDFDevice::drawPath(const SkDraw& d,
const SkPath& origPath,
const SkPaint& srcPaint,
const SkMatrix* prePathMatrix,
bool pathIsMutable) {
SkPaint paint = srcPaint;
replace_srcmode_on_opaque_paint(&paint);
SkPath modifiedPath;
SkPath* pathPtr = const_cast<SkPath*>(&origPath);
SkMatrix matrix = *d.fMatrix;
if (prePathMatrix) {
if (paint.getPathEffect() || paint.getStyle() != SkPaint::kFill_Style) {
if (!pathIsMutable) {
pathPtr = &modifiedPath;
pathIsMutable = true;
}
origPath.transform(*prePathMatrix, pathPtr);
} else {
matrix.preConcat(*prePathMatrix);
}
}
if (paint.getPathEffect()) {
if (d.fClip->isEmpty()) {
return;
}
if (!pathIsMutable) {
pathPtr = &modifiedPath;
pathIsMutable = true;
}
bool fill = paint.getFillPath(origPath, pathPtr);
SkPaint noEffectPaint(paint);
noEffectPaint.setPathEffect(nullptr);
if (fill) {
noEffectPaint.setStyle(SkPaint::kFill_Style);
} else {
noEffectPaint.setStyle(SkPaint::kStroke_Style);
noEffectPaint.setStrokeWidth(0);
}
drawPath(d, *pathPtr, noEffectPaint, nullptr, true);
return;
}
if (handleInversePath(d, origPath, paint, pathIsMutable, prePathMatrix)) {
return;
}
if (SkAnnotation* annotation = paint.getAnnotation()) {
if (handlePathAnnotation(*pathPtr, d, annotation)) {
return;
}
}
ScopedContentEntry content(this, d.fClipStack, *d.fClip, matrix, paint);
if (!content.entry()) {
return;
}
bool consumeDegeratePathSegments =
paint.getStyle() == SkPaint::kFill_Style ||
(paint.getStrokeCap() != SkPaint::kRound_Cap &&
paint.getStrokeCap() != SkPaint::kSquare_Cap);
SkPDFUtils::EmitPath(*pathPtr, paint.getStyle(),
consumeDegeratePathSegments,
&content.entry()->fContent);
SkPDFUtils::PaintPath(paint.getStyle(), pathPtr->getFillType(),
&content.entry()->fContent);
}
void SkPDFDevice::drawBitmapRect(const SkDraw& draw,
const SkBitmap& bitmap,
const SkRect* src,
const SkRect& dst,
const SkPaint& srcPaint,
SkCanvas::SrcRectConstraint constraint) {
const SkImage* image = fCanon->bitmapToImage(bitmap);
if (!image) {
return;
}
// ownership of this image is retained by the canon.
this->drawImageRect(draw, image, src, dst, srcPaint, constraint);
}
void SkPDFDevice::drawBitmap(const SkDraw& d,
const SkBitmap& bitmap,
const SkMatrix& matrix,
const SkPaint& srcPaint) {
SkPaint paint = srcPaint;
if (bitmap.isOpaque()) {
replace_srcmode_on_opaque_paint(&paint);
}
if (d.fClip->isEmpty()) {
return;
}
SkMatrix transform = matrix;
transform.postConcat(*d.fMatrix);
const SkImage* image = fCanon->bitmapToImage(bitmap);
if (!image) {
return;
}
this->internalDrawImage(transform, d.fClipStack, *d.fClip, image, nullptr,
paint);
}
void SkPDFDevice::drawSprite(const SkDraw& d,
const SkBitmap& bitmap,
int x,
int y,
const SkPaint& srcPaint) {
SkPaint paint = srcPaint;
if (bitmap.isOpaque()) {
replace_srcmode_on_opaque_paint(&paint);
}
if (d.fClip->isEmpty()) {
return;
}
SkMatrix matrix;
matrix.setTranslate(SkIntToScalar(x), SkIntToScalar(y));
const SkImage* image = fCanon->bitmapToImage(bitmap);
if (!image) {
return;
}
this->internalDrawImage(matrix, d.fClipStack, *d.fClip, image, nullptr,
paint);
}
void SkPDFDevice::drawImage(const SkDraw& draw,
const SkImage* image,
SkScalar x,
SkScalar y,
const SkPaint& srcPaint) {
SkPaint paint = srcPaint;
if (!image) {
return;
}
if (image->isOpaque()) {
replace_srcmode_on_opaque_paint(&paint);
}
if (draw.fClip->isEmpty()) {
return;
}
SkMatrix transform = SkMatrix::MakeTrans(x, y);
transform.postConcat(*draw.fMatrix);
this->internalDrawImage(transform, draw.fClipStack, *draw.fClip, image,
nullptr, paint);
}
void SkPDFDevice::drawImageRect(const SkDraw& draw,
const SkImage* image,
const SkRect* src,
const SkRect& dst,
const SkPaint& srcPaint,
SkCanvas::SrcRectConstraint constraint) {
if (!image) {
return;
}
if (draw.fClip->isEmpty()) {
return;
}
SkPaint paint = srcPaint;
if (image->isOpaque()) {
replace_srcmode_on_opaque_paint(&paint);
}
// TODO: this code path must be updated to respect the flags parameter
SkMatrix matrix;
SkRect tmpSrc, tmpDst;
SkRect imageBounds = SkRect::Make(image->bounds());
// Compute matrix from the two rectangles
if (src) {
tmpSrc = *src;
} else {
tmpSrc = imageBounds;
}
matrix.setRectToRect(tmpSrc, dst, SkMatrix::kFill_ScaleToFit);
// clip the tmpSrc to the bounds of the bitmap, and recompute dstRect if
// needed (if the src was clipped). No check needed if src==null.
SkAutoTUnref<const SkImage> autoImageUnref;
if (src) {
if (!imageBounds.contains(*src)) {
if (!tmpSrc.intersect(imageBounds)) {
return; // nothing to draw
}
// recompute dst, based on the smaller tmpSrc
matrix.mapRect(&tmpDst, tmpSrc);
}
// since we may need to clamp to the borders of the src rect within
// the bitmap, we extract a subset.
SkIRect srcIR;
tmpSrc.roundOut(&srcIR);
autoImageUnref.reset(image->newSubset(srcIR));
if (!autoImageUnref) {
return;
}
image = autoImageUnref;
// Since we did an extract, we need to adjust the matrix accordingly
SkScalar dx = 0, dy = 0;
if (srcIR.fLeft > 0) {
dx = SkIntToScalar(srcIR.fLeft);
}
if (srcIR.fTop > 0) {
dy = SkIntToScalar(srcIR.fTop);
}
if (dx || dy) {
matrix.preTranslate(dx, dy);
}
}
matrix.postConcat(*draw.fMatrix);
this->internalDrawImage(matrix, draw.fClipStack, *draw.fClip, image,
nullptr, paint);
}
// Create a PDF string. Maximum length (in bytes) is 65,535.
// @param input A string value.
// @param len The length of the input array.
// @param wideChars True iff the upper byte in each uint16_t is
// significant and should be encoded and not
// discarded. If true, the upper byte is encoded
// first. Otherwise, we assert the upper byte is
// zero.
static SkString format_wide_string(const uint16_t* input,
size_t len,
bool wideChars) {
if (wideChars) {
SkASSERT(2 * len < 65535);
static const char gHex[] = "0123456789ABCDEF";
SkString result(4 * len + 2);
result[0] = '<';
for (size_t i = 0; i < len; i++) {
result[4 * i + 1] = gHex[(input[i] >> 12) & 0xF];
result[4 * i + 2] = gHex[(input[i] >> 8) & 0xF];
result[4 * i + 3] = gHex[(input[i] >> 4) & 0xF];
result[4 * i + 4] = gHex[(input[i] ) & 0xF];
}
result[4 * len + 1] = '>';
return result;
} else {
SkASSERT(len <= 65535);
SkString tmp(len);
for (size_t i = 0; i < len; i++) {
SkASSERT(0 == input[i] >> 8);
tmp[i] = static_cast<uint8_t>(input[i]);
}
return SkPDFUtils::FormatString(tmp.c_str(), tmp.size());
}
}
static void draw_transparent_text(SkPDFDevice* device,
const SkDraw& d,
const void* text, size_t len,
SkScalar x, SkScalar y,
const SkPaint& srcPaint) {
SkPaint transparent;
if (!SkPDFFont::CanEmbedTypeface(transparent.getTypeface(),
device->getCanon())) {
SkDEBUGFAIL("default typeface should be embeddable");
return; // Avoid infinite loop in release.
}
transparent.setTextSize(srcPaint.getTextSize());
transparent.setColor(SK_ColorTRANSPARENT);
switch (srcPaint.getTextEncoding()) {
case SkPaint::kGlyphID_TextEncoding: {
// Since a glyphId<->Unicode mapping is typeface-specific,
// map back to Unicode first.
size_t glyphCount = len / 2;
SkAutoTMalloc<SkUnichar> unichars(glyphCount);
srcPaint.glyphsToUnichars(
(const uint16_t*)text, SkToInt(glyphCount), &unichars[0]);
transparent.setTextEncoding(SkPaint::kUTF32_TextEncoding);
device->drawText(d, &unichars[0],
glyphCount * sizeof(SkUnichar),
x, y, transparent);
break;
}
case SkPaint::kUTF8_TextEncoding:
case SkPaint::kUTF16_TextEncoding:
case SkPaint::kUTF32_TextEncoding:
transparent.setTextEncoding(srcPaint.getTextEncoding());
device->drawText(d, text, len, x, y, transparent);
break;
default:
SkFAIL("unknown text encoding");
}
}
void SkPDFDevice::drawText(const SkDraw& d, const void* text, size_t len,
SkScalar x, SkScalar y, const SkPaint& srcPaint) {
if (!SkPDFFont::CanEmbedTypeface(srcPaint.getTypeface(), fCanon)) {
// https://bug.skia.org/3866
SkPath path;
srcPaint.getTextPath(text, len, x, y, &path);
this->drawPath(d, path, srcPaint, &SkMatrix::I(), true);
// Draw text transparently to make it copyable/searchable/accessable.
draw_transparent_text(this, d, text, len, x, y, srcPaint);
return;
}
SkPaint paint = srcPaint;
replace_srcmode_on_opaque_paint(&paint);
NOT_IMPLEMENTED(paint.getMaskFilter() != nullptr, false);
if (paint.getMaskFilter() != nullptr) {
// Don't pretend we support drawing MaskFilters, it makes for artifacts
// making text unreadable (e.g. same text twice when using CSS shadows).
return;
}
SkPaint textPaint = calculate_text_paint(paint);
ScopedContentEntry content(this, d, textPaint, true);
if (!content.entry()) {
return;
}
SkGlyphStorage storage(0);
const uint16_t* glyphIDs = nullptr;
int numGlyphs = force_glyph_encoding(paint, text, len, &storage, &glyphIDs);
textPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
SkDrawCacheProc glyphCacheProc = textPaint.getDrawCacheProc();
align_text(glyphCacheProc, textPaint, glyphIDs, numGlyphs, &x, &y);
content.entry()->fContent.writeText("BT\n");
set_text_transform(x, y, textPaint.getTextSkewX(),
&content.entry()->fContent);
int consumedGlyphCount = 0;
SkTDArray<uint16_t> glyphIDsCopy(glyphIDs, numGlyphs);
while (numGlyphs > consumedGlyphCount) {
this->updateFont(textPaint, glyphIDs[consumedGlyphCount], content.entry());
SkPDFFont* font = content.entry()->fState.fFont;
int availableGlyphs = font->glyphsToPDFFontEncoding(
glyphIDsCopy.begin() + consumedGlyphCount,
numGlyphs - consumedGlyphCount);
fFontGlyphUsage->noteGlyphUsage(
font, glyphIDsCopy.begin() + consumedGlyphCount,
availableGlyphs);
SkString encodedString =
format_wide_string(glyphIDsCopy.begin() + consumedGlyphCount,
availableGlyphs, font->multiByteGlyphs());
content.entry()->fContent.writeText(encodedString.c_str());
consumedGlyphCount += availableGlyphs;
content.entry()->fContent.writeText(" Tj\n");
}
content.entry()->fContent.writeText("ET\n");
}
void SkPDFDevice::drawPosText(const SkDraw& d, const void* text, size_t len,
const SkScalar pos[], int scalarsPerPos,
const SkPoint& offset, const SkPaint& srcPaint) {
if (!SkPDFFont::CanEmbedTypeface(srcPaint.getTypeface(), fCanon)) {
const SkPoint* positions = reinterpret_cast<const SkPoint*>(pos);
SkAutoTMalloc<SkPoint> positionsBuffer;
if (2 != scalarsPerPos) {
int glyphCount = srcPaint.textToGlyphs(text, len, NULL);
positionsBuffer.reset(glyphCount);
for (int i = 0; i < glyphCount; ++i) {
positionsBuffer[i].set(pos[i], 0.0f);
}
positions = &positionsBuffer[0];
}
SkPath path;
srcPaint.getPosTextPath(text, len, positions, &path);
SkMatrix matrix;
matrix.setTranslate(offset);
this->drawPath(d, path, srcPaint, &matrix, true);
// Draw text transparently to make it copyable/searchable/accessable.
draw_transparent_text(
this, d, text, len, offset.x() + positions[0].x(),
offset.y() + positions[0].y(), srcPaint);
return;
}
SkPaint paint = srcPaint;
replace_srcmode_on_opaque_paint(&paint);
NOT_IMPLEMENTED(paint.getMaskFilter() != nullptr, false);
if (paint.getMaskFilter() != nullptr) {
// Don't pretend we support drawing MaskFilters, it makes for artifacts
// making text unreadable (e.g. same text twice when using CSS shadows).
return;
}
SkASSERT(1 == scalarsPerPos || 2 == scalarsPerPos);
SkPaint textPaint = calculate_text_paint(paint);
ScopedContentEntry content(this, d, textPaint, true);
if (!content.entry()) {
return;
}
SkGlyphStorage storage(0);
const uint16_t* glyphIDs = nullptr;
size_t numGlyphs = force_glyph_encoding(paint, text, len, &storage, &glyphIDs);
textPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
SkDrawCacheProc glyphCacheProc = textPaint.getDrawCacheProc();
content.entry()->fContent.writeText("BT\n");
this->updateFont(textPaint, glyphIDs[0], content.entry());
for (size_t i = 0; i < numGlyphs; i++) {
SkPDFFont* font = content.entry()->fState.fFont;
uint16_t encodedValue = glyphIDs[i];
if (font->glyphsToPDFFontEncoding(&encodedValue, 1) != 1) {
// The current pdf font cannot encode the current glyph.
// Try to get a pdf font which can encode the current glyph.
this->updateFont(textPaint, glyphIDs[i], content.entry());
font = content.entry()->fState.fFont;
if (font->glyphsToPDFFontEncoding(&encodedValue, 1) != 1) {
SkDEBUGFAIL("PDF could not encode glyph.");
continue;
}
}
fFontGlyphUsage->noteGlyphUsage(font, &encodedValue, 1);
SkScalar x = offset.x() + pos[i * scalarsPerPos];
SkScalar y = offset.y() + (2 == scalarsPerPos ? pos[i * scalarsPerPos + 1] : 0);
align_text(glyphCacheProc, textPaint, glyphIDs + i, 1, &x, &y);
set_text_transform(x, y, textPaint.getTextSkewX(), &content.entry()->fContent);
SkString encodedString =
format_wide_string(&encodedValue, 1, font->multiByteGlyphs());
content.entry()->fContent.writeText(encodedString.c_str());
content.entry()->fContent.writeText(" Tj\n");
}
content.entry()->fContent.writeText("ET\n");
}
void SkPDFDevice::drawVertices(const SkDraw& d, SkCanvas::VertexMode,
int vertexCount, const SkPoint verts[],
const SkPoint texs[], const SkColor colors[],
SkXfermode* xmode, const uint16_t indices[],
int indexCount, const SkPaint& paint) {
if (d.fClip->isEmpty()) {
return;
}
// TODO: implement drawVertices
}
struct RectWithData {
SkRect rect;
SkAutoTUnref<const SkData> data;
RectWithData(const SkRect& rect, const SkData* data)
: rect(rect), data(SkRef(data)) {}
};
struct NamedDestination {
SkAutoTUnref<const SkData> nameData;
SkPoint point;
NamedDestination(const SkData* nameData, const SkPoint& point)
: nameData(SkRef(nameData)), point(point) {}
};
void SkPDFDevice::drawDevice(const SkDraw& d, SkBaseDevice* device,
int x, int y, const SkPaint& paint) {
// our onCreateCompatibleDevice() always creates SkPDFDevice subclasses.
SkPDFDevice* pdfDevice = static_cast<SkPDFDevice*>(device);
SkScalar scalarX = SkIntToScalar(x);
SkScalar scalarY = SkIntToScalar(y);
for (RectWithData* link : pdfDevice->fLinkToURLs) {
fLinkToURLs.push(new RectWithData(
link->rect.makeOffset(scalarX, scalarY), link->data));
}
for (RectWithData* link : pdfDevice->fLinkToDestinations) {
fLinkToDestinations.push(new RectWithData(
link->rect.makeOffset(scalarX, scalarY), link->data));
}
for (NamedDestination* d : pdfDevice->fNamedDestinations) {
fNamedDestinations.push(new NamedDestination(
d->nameData, d->point + SkPoint::Make(scalarX, scalarY)));
}
if (pdfDevice->isContentEmpty()) {
return;
}
SkMatrix matrix;
matrix.setTranslate(SkIntToScalar(x), SkIntToScalar(y));
ScopedContentEntry content(this, d.fClipStack, *d.fClip, matrix, paint);
if (!content.entry()) {
return;
}
if (content.needShape()) {
SkPath shape;
shape.addRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
SkIntToScalar(device->width()),
SkIntToScalar(device->height())));
content.setShape(shape);
}
if (!content.needSource()) {
return;
}
SkAutoTUnref<SkPDFFormXObject> xObject(new SkPDFFormXObject(pdfDevice));
SkPDFUtils::DrawFormXObject(this->addXObjectResource(xObject.get()),
&content.entry()->fContent);
// Merge glyph sets from the drawn device.
fFontGlyphUsage->merge(pdfDevice->getFontGlyphUsage());
}
SkImageInfo SkPDFDevice::imageInfo() const {
return fLegacyBitmap.info();
}
void SkPDFDevice::onAttachToCanvas(SkCanvas* canvas) {
INHERITED::onAttachToCanvas(canvas);
// Canvas promises that this ptr is valid until onDetachFromCanvas is called
fClipStack = canvas->getClipStack();
}
void SkPDFDevice::onDetachFromCanvas() {
INHERITED::onDetachFromCanvas();
fClipStack = nullptr;
}
SkSurface* SkPDFDevice::newSurface(const SkImageInfo& info, const SkSurfaceProps& props) {
return SkSurface::NewRaster(info, &props);
}
ContentEntry* SkPDFDevice::getLastContentEntry() {
if (fDrawingArea == kContent_DrawingArea) {
return fLastContentEntry;
} else {
return fLastMarginContentEntry;
}
}
SkAutoTDelete<ContentEntry>* SkPDFDevice::getContentEntries() {
if (fDrawingArea == kContent_DrawingArea) {
return &fContentEntries;
} else {
return &fMarginContentEntries;
}
}
void SkPDFDevice::setLastContentEntry(ContentEntry* contentEntry) {
if (fDrawingArea == kContent_DrawingArea) {
fLastContentEntry = contentEntry;
} else {
fLastMarginContentEntry = contentEntry;
}
}
void SkPDFDevice::setDrawingArea(DrawingArea drawingArea) {
// A ScopedContentEntry only exists during the course of a draw call, so
// this can't be called while a ScopedContentEntry exists.
fDrawingArea = drawingArea;
}
SkPDFDict* SkPDFDevice::createResourceDict() const {
SkTDArray<SkPDFObject*> fonts;
fonts.setReserve(fFontResources.count());
for (SkPDFFont* font : fFontResources) {
fonts.push(font);
}
return SkPDFResourceDict::Create(
&fGraphicStateResources,
&fShaderResources,
&fXObjectResources,
&fonts);
}
const SkTDArray<SkPDFFont*>& SkPDFDevice::getFontResources() const {
return fFontResources;
}
SkPDFArray* SkPDFDevice::copyMediaBox() const {
// should this be a singleton?
SkAutoTUnref<SkPDFArray> mediaBox(new SkPDFArray);
mediaBox->reserve(4);
mediaBox->appendInt(0);
mediaBox->appendInt(0);
mediaBox->appendInt(fPageSize.fWidth);
mediaBox->appendInt(fPageSize.fHeight);
return mediaBox.detach();
}
SkStreamAsset* SkPDFDevice::content() const {
SkDynamicMemoryWStream buffer;
this->writeContent(&buffer);
return buffer.bytesWritten() > 0
? buffer.detachAsStream()
: new SkMemoryStream;
}
void SkPDFDevice::copyContentEntriesToData(ContentEntry* entry,
SkWStream* data) const {
// TODO(ctguil): For margins, I'm not sure fExistingClipStack/Region is the
// right thing to pass here.
GraphicStackState gsState(fExistingClipStack, fExistingClipRegion, data);
while (entry != nullptr) {
SkPoint translation;
translation.iset(this->getOrigin());
translation.negate();
gsState.updateClip(entry->fState.fClipStack, entry->fState.fClipRegion,
translation);
gsState.updateMatrix(entry->fState.fMatrix);
gsState.updateDrawingState(entry->fState);
entry->fContent.writeToStream(data);
entry = entry->fNext.get();
}
gsState.drainStack();
}
void SkPDFDevice::writeContent(SkWStream* out) const {
if (fInitialTransform.getType() != SkMatrix::kIdentity_Mask) {
SkPDFUtils::AppendTransform(fInitialTransform, out);
}
// TODO(aayushkumar): Apply clip along the margins. Currently, webkit
// colors the contentArea white before it starts drawing into it and
// that currently acts as our clip.
// Also, think about adding a transform here (or assume that the values
// sent across account for that)
SkPDFDevice::copyContentEntriesToData(fMarginContentEntries.get(), out);
// If the content area is the entire page, then we don't need to clip
// the content area (PDF area clips to the page size). Otherwise,
// we have to clip to the content area; we've already applied the
// initial transform, so just clip to the device size.
if (fPageSize != fContentSize) {
SkRect r = SkRect::MakeWH(SkIntToScalar(this->width()),
SkIntToScalar(this->height()));
emit_clip(nullptr, &r, out);
}
SkPDFDevice::copyContentEntriesToData(fContentEntries.get(), out);
}
/* Draws an inverse filled path by using Path Ops to compute the positive
* inverse using the current clip as the inverse bounds.
* Return true if this was an inverse path and was properly handled,
* otherwise returns false and the normal drawing routine should continue,
* either as a (incorrect) fallback or because the path was not inverse
* in the first place.
*/
bool SkPDFDevice::handleInversePath(const SkDraw& d, const SkPath& origPath,
const SkPaint& paint, bool pathIsMutable,
const SkMatrix* prePathMatrix) {
if (!origPath.isInverseFillType()) {
return false;
}
if (d.fClip->isEmpty()) {
return false;
}
SkPath modifiedPath;
SkPath* pathPtr = const_cast<SkPath*>(&origPath);
SkPaint noInversePaint(paint);
// Merge stroking operations into final path.
if (SkPaint::kStroke_Style == paint.getStyle() ||
SkPaint::kStrokeAndFill_Style == paint.getStyle()) {
bool doFillPath = paint.getFillPath(origPath, &modifiedPath);
if (doFillPath) {
noInversePaint.setStyle(SkPaint::kFill_Style);
noInversePaint.setStrokeWidth(0);
pathPtr = &modifiedPath;
} else {
// To be consistent with the raster output, hairline strokes
// are rendered as non-inverted.
modifiedPath.toggleInverseFillType();
drawPath(d, modifiedPath, paint, nullptr, true);
return true;
}
}
// Get bounds of clip in current transform space
// (clip bounds are given in device space).
SkRect bounds;
SkMatrix transformInverse;
SkMatrix totalMatrix = *d.fMatrix;
if (prePathMatrix) {
totalMatrix.preConcat(*prePathMatrix);
}
if (!totalMatrix.invert(&transformInverse)) {
return false;
}
bounds.set(d.fClip->getBounds());
transformInverse.mapRect(&bounds);
// Extend the bounds by the line width (plus some padding)
// so the edge doesn't cause a visible stroke.
bounds.outset(paint.getStrokeWidth() + SK_Scalar1,
paint.getStrokeWidth() + SK_Scalar1);
if (!calculate_inverse_path(bounds, *pathPtr, &modifiedPath)) {
return false;
}
drawPath(d, modifiedPath, noInversePaint, prePathMatrix, true);
return true;
}
bool SkPDFDevice::handlePointAnnotation(const SkPoint* points, size_t count,
const SkMatrix& matrix,
SkAnnotation* annotationInfo) {
SkData* nameData = annotationInfo->find(
SkAnnotationKeys::Define_Named_Dest_Key());
if (nameData) {
for (size_t i = 0; i < count; i++) {
SkPoint transformedPoint;
matrix.mapXY(points[i].x(), points[i].y(), &transformedPoint);
fNamedDestinations.push(new NamedDestination(nameData, transformedPoint));
}
return true;
}
return false;
}
bool SkPDFDevice::handlePathAnnotation(const SkPath& path,
const SkDraw& d,
SkAnnotation* annotation) {
SkASSERT(annotation);
SkPath transformedPath = path;
transformedPath.transform(*d.fMatrix);
SkRasterClip clip = *d.fRC;
clip.op(transformedPath, SkIRect::MakeWH(width(), height()), SkRegion::kIntersect_Op,
false);
SkRect transformedRect = SkRect::Make(clip.getBounds());
SkData* urlData = annotation->find(SkAnnotationKeys::URL_Key());
if (urlData) {
if (!transformedRect.isEmpty()) {
fLinkToURLs.push(new RectWithData(transformedRect, urlData));
}
return true;
}
SkData* linkToDestination =
annotation->find(SkAnnotationKeys::Link_Named_Dest_Key());
if (linkToDestination) {
if (!transformedRect.isEmpty()) {
fLinkToDestinations.push(new RectWithData(transformedRect, linkToDestination));
}
return true;
}
return false;
}
void SkPDFDevice::appendAnnotations(SkPDFArray* array) const {
array->reserve(fLinkToURLs.count() + fLinkToDestinations.count());
for (RectWithData* rectWithURL : fLinkToURLs) {
SkRect r;
fInitialTransform.mapRect(&r, rectWithURL->rect);
array->appendObject(create_link_to_url(rectWithURL->data, r));
}
for (RectWithData* linkToDestination : fLinkToDestinations) {
SkRect r;
fInitialTransform.mapRect(&r, linkToDestination->rect);
array->appendObject(create_link_named_dest(linkToDestination->data, r));
}
}
void SkPDFDevice::appendDestinations(SkPDFDict* dict, SkPDFObject* page) const {
for (NamedDestination* dest : fNamedDestinations) {
SkAutoTUnref<SkPDFArray> pdfDest(new SkPDFArray);
pdfDest->reserve(5);
pdfDest->appendObjRef(SkRef(page));
pdfDest->appendName("XYZ");
SkPoint p = fInitialTransform.mapXY(dest->point.x(), dest->point.y());
pdfDest->appendScalar(p.x());
pdfDest->appendScalar(p.y());
pdfDest->appendInt(0); // Leave zoom unchanged
SkString name(static_cast<const char*>(dest->nameData->data()));
dict->insertObject(name, pdfDest.detach());
}
}
SkPDFFormXObject* SkPDFDevice::createFormXObjectFromDevice() {
SkPDFFormXObject* xobject = new SkPDFFormXObject(this);
// We always draw the form xobjects that we create back into the device, so
// we simply preserve the font usage instead of pulling it out and merging
// it back in later.
cleanUp(false); // Reset this device to have no content.
init();
return xobject;
}
void SkPDFDevice::drawFormXObjectWithMask(int xObjectIndex,
SkPDFFormXObject* mask,
const SkClipStack* clipStack,
const SkRegion& clipRegion,
SkXfermode::Mode mode,
bool invertClip) {
if (clipRegion.isEmpty() && !invertClip) {
return;
}
SkAutoTUnref<SkPDFObject> sMaskGS(SkPDFGraphicState::GetSMaskGraphicState(
mask, invertClip, SkPDFGraphicState::kAlpha_SMaskMode));
SkMatrix identity;
identity.reset();
SkPaint paint;
paint.setXfermodeMode(mode);
ScopedContentEntry content(this, clipStack, clipRegion, identity, paint);
if (!content.entry()) {
return;
}
SkPDFUtils::ApplyGraphicState(addGraphicStateResource(sMaskGS.get()),
&content.entry()->fContent);
SkPDFUtils::DrawFormXObject(xObjectIndex, &content.entry()->fContent);
sMaskGS.reset(SkPDFGraphicState::GetNoSMaskGraphicState());
SkPDFUtils::ApplyGraphicState(addGraphicStateResource(sMaskGS.get()),
&content.entry()->fContent);
}
ContentEntry* SkPDFDevice::setUpContentEntry(const SkClipStack* clipStack,
const SkRegion& clipRegion,
const SkMatrix& matrix,
const SkPaint& paint,
bool hasText,
SkPDFFormXObject** dst) {
*dst = nullptr;
if (clipRegion.isEmpty()) {
return nullptr;
}
// The clip stack can come from an SkDraw where it is technically optional.
SkClipStack synthesizedClipStack;
if (clipStack == nullptr) {
if (clipRegion == fExistingClipRegion) {
clipStack = &fExistingClipStack;
} else {
// GraphicStackState::updateClip expects the clip stack to have
// fExistingClip as a prefix, so start there, then set the clip
// to the passed region.
synthesizedClipStack = fExistingClipStack;
SkPath clipPath;
clipRegion.getBoundaryPath(&clipPath);
synthesizedClipStack.clipDevPath(clipPath, SkRegion::kReplace_Op,
false);
clipStack = &synthesizedClipStack;
}
}
SkXfermode::Mode xfermode = SkXfermode::kSrcOver_Mode;
if (paint.getXfermode()) {
paint.getXfermode()->asMode(&xfermode);
}
// For the following modes, we want to handle source and destination
// separately, so make an object of what's already there.
if (xfermode == SkXfermode::kClear_Mode ||
xfermode == SkXfermode::kSrc_Mode ||
xfermode == SkXfermode::kSrcIn_Mode ||
xfermode == SkXfermode::kDstIn_Mode ||
xfermode == SkXfermode::kSrcOut_Mode ||
xfermode == SkXfermode::kDstOut_Mode ||
xfermode == SkXfermode::kSrcATop_Mode ||
xfermode == SkXfermode::kDstATop_Mode ||
xfermode == SkXfermode::kModulate_Mode) {
if (!isContentEmpty()) {
*dst = createFormXObjectFromDevice();
SkASSERT(isContentEmpty());
} else if (xfermode != SkXfermode::kSrc_Mode &&
xfermode != SkXfermode::kSrcOut_Mode) {
// Except for Src and SrcOut, if there isn't anything already there,
// then we're done.
return nullptr;
}
}
// TODO(vandebo): Figure out how/if we can handle the following modes:
// Xor, Plus.
// Dst xfer mode doesn't draw source at all.
if (xfermode == SkXfermode::kDst_Mode) {
return nullptr;
}
ContentEntry* entry;
SkAutoTDelete<ContentEntry> newEntry;
ContentEntry* lastContentEntry = getLastContentEntry();
if (lastContentEntry && lastContentEntry->fContent.getOffset() == 0) {
entry = lastContentEntry;
} else {
newEntry.reset(new ContentEntry);
entry = newEntry.get();
}
populateGraphicStateEntryFromPaint(matrix, *clipStack, clipRegion, paint,
hasText, &entry->fState);
if (lastContentEntry && xfermode != SkXfermode::kDstOver_Mode &&
entry->fState.compareInitialState(lastContentEntry->fState)) {
return lastContentEntry;
}
SkAutoTDelete<ContentEntry>* contentEntries = getContentEntries();
if (!lastContentEntry) {
contentEntries->reset(entry);
setLastContentEntry(entry);
} else if (xfermode == SkXfermode::kDstOver_Mode) {
entry->fNext.reset(contentEntries->detach());
contentEntries->reset(entry);
} else {
lastContentEntry->fNext.reset(entry);
setLastContentEntry(entry);
}
newEntry.detach();
return entry;
}
void SkPDFDevice::finishContentEntry(SkXfermode::Mode xfermode,
SkPDFFormXObject* dst,
SkPath* shape) {
if (xfermode != SkXfermode::kClear_Mode &&
xfermode != SkXfermode::kSrc_Mode &&
xfermode != SkXfermode::kDstOver_Mode &&
xfermode != SkXfermode::kSrcIn_Mode &&
xfermode != SkXfermode::kDstIn_Mode &&
xfermode != SkXfermode::kSrcOut_Mode &&
xfermode != SkXfermode::kDstOut_Mode &&
xfermode != SkXfermode::kSrcATop_Mode &&
xfermode != SkXfermode::kDstATop_Mode &&
xfermode != SkXfermode::kModulate_Mode) {
SkASSERT(!dst);
return;
}
if (xfermode == SkXfermode::kDstOver_Mode) {
SkASSERT(!dst);
ContentEntry* firstContentEntry = getContentEntries()->get();
if (firstContentEntry->fContent.getOffset() == 0) {
// For DstOver, an empty content entry was inserted before the rest
// of the content entries. If nothing was drawn, it needs to be
// removed.
SkAutoTDelete<ContentEntry>* contentEntries = getContentEntries();
contentEntries->reset(firstContentEntry->fNext.detach());
}
return;
}
if (!dst) {
SkASSERT(xfermode == SkXfermode::kSrc_Mode ||
xfermode == SkXfermode::kSrcOut_Mode);
return;
}
ContentEntry* contentEntries = getContentEntries()->get();
SkASSERT(dst);
SkASSERT(!contentEntries->fNext.get());
// Changing the current content into a form-xobject will destroy the clip
// objects which is fine since the xobject will already be clipped. However
// if source has shape, we need to clip it too, so a copy of the clip is
// saved.
SkClipStack clipStack = contentEntries->fState.fClipStack;
SkRegion clipRegion = contentEntries->fState.fClipRegion;
SkMatrix identity;
identity.reset();
SkPaint stockPaint;
SkAutoTUnref<SkPDFFormXObject> srcFormXObject;
if (isContentEmpty()) {
// If nothing was drawn and there's no shape, then the draw was a
// no-op, but dst needs to be restored for that to be true.
// If there is shape, then an empty source with Src, SrcIn, SrcOut,
// DstIn, DstAtop or Modulate reduces to Clear and DstOut or SrcAtop
// reduces to Dst.
if (shape == nullptr || xfermode == SkXfermode::kDstOut_Mode ||
xfermode == SkXfermode::kSrcATop_Mode) {
ScopedContentEntry content(this, &fExistingClipStack,
fExistingClipRegion, identity,
stockPaint);
SkPDFUtils::DrawFormXObject(this->addXObjectResource(dst),
&content.entry()->fContent);
return;
} else {
xfermode = SkXfermode::kClear_Mode;
}
} else {
SkASSERT(!fContentEntries->fNext.get());
srcFormXObject.reset(createFormXObjectFromDevice());
}
// TODO(vandebo) srcFormXObject may contain alpha, but here we want it
// without alpha.
if (xfermode == SkXfermode::kSrcATop_Mode) {
// TODO(vandebo): In order to properly support SrcATop we have to track
// the shape of what's been drawn at all times. It's the intersection of
// the non-transparent parts of the device and the outlines (shape) of
// all images and devices drawn.
drawFormXObjectWithMask(addXObjectResource(srcFormXObject.get()), dst,
&fExistingClipStack, fExistingClipRegion,
SkXfermode::kSrcOver_Mode, true);
} else {
SkAutoTUnref<SkPDFFormXObject> dstMaskStorage;
SkPDFFormXObject* dstMask = srcFormXObject.get();
if (shape != nullptr) {
// Draw shape into a form-xobject.
SkDraw d;
d.fMatrix = &identity;
d.fClip = &clipRegion;
d.fClipStack = &clipStack;
SkPaint filledPaint;
filledPaint.setColor(SK_ColorBLACK);
filledPaint.setStyle(SkPaint::kFill_Style);
this->drawPath(d, *shape, filledPaint, nullptr, true);
dstMaskStorage.reset(createFormXObjectFromDevice());
dstMask = dstMaskStorage.get();
}
drawFormXObjectWithMask(addXObjectResource(dst), dstMask,
&fExistingClipStack, fExistingClipRegion,
SkXfermode::kSrcOver_Mode, true);
}
if (xfermode == SkXfermode::kClear_Mode) {
return;
} else if (xfermode == SkXfermode::kSrc_Mode ||
xfermode == SkXfermode::kDstATop_Mode) {
ScopedContentEntry content(this, &fExistingClipStack,
fExistingClipRegion, identity, stockPaint);
if (content.entry()) {
SkPDFUtils::DrawFormXObject(
this->addXObjectResource(srcFormXObject.get()),
&content.entry()->fContent);
}
if (xfermode == SkXfermode::kSrc_Mode) {
return;
}
} else if (xfermode == SkXfermode::kSrcATop_Mode) {
ScopedContentEntry content(this, &fExistingClipStack,
fExistingClipRegion, identity, stockPaint);
if (content.entry()) {
SkPDFUtils::DrawFormXObject(this->addXObjectResource(dst),
&content.entry()->fContent);
}
}
SkASSERT(xfermode == SkXfermode::kSrcIn_Mode ||
xfermode == SkXfermode::kDstIn_Mode ||
xfermode == SkXfermode::kSrcOut_Mode ||
xfermode == SkXfermode::kDstOut_Mode ||
xfermode == SkXfermode::kSrcATop_Mode ||
xfermode == SkXfermode::kDstATop_Mode ||
xfermode == SkXfermode::kModulate_Mode);
if (xfermode == SkXfermode::kSrcIn_Mode ||
xfermode == SkXfermode::kSrcOut_Mode ||
xfermode == SkXfermode::kSrcATop_Mode) {
drawFormXObjectWithMask(addXObjectResource(srcFormXObject.get()), dst,
&fExistingClipStack, fExistingClipRegion,
SkXfermode::kSrcOver_Mode,
xfermode == SkXfermode::kSrcOut_Mode);
} else {
SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode;
if (xfermode == SkXfermode::kModulate_Mode) {
drawFormXObjectWithMask(addXObjectResource(srcFormXObject.get()),
dst, &fExistingClipStack,
fExistingClipRegion,
SkXfermode::kSrcOver_Mode, false);
mode = SkXfermode::kMultiply_Mode;
}
drawFormXObjectWithMask(addXObjectResource(dst), srcFormXObject.get(),
&fExistingClipStack, fExistingClipRegion, mode,
xfermode == SkXfermode::kDstOut_Mode);
}
}
bool SkPDFDevice::isContentEmpty() {
ContentEntry* contentEntries = getContentEntries()->get();
if (!contentEntries || contentEntries->fContent.getOffset() == 0) {
SkASSERT(!contentEntries || !contentEntries->fNext.get());
return true;
}
return false;
}
void SkPDFDevice::populateGraphicStateEntryFromPaint(
const SkMatrix& matrix,
const SkClipStack& clipStack,
const SkRegion& clipRegion,
const SkPaint& paint,
bool hasText,
GraphicStateEntry* entry) {
NOT_IMPLEMENTED(paint.getPathEffect() != nullptr, false);
NOT_IMPLEMENTED(paint.getMaskFilter() != nullptr, false);
NOT_IMPLEMENTED(paint.getColorFilter() != nullptr, false);
entry->fMatrix = matrix;
entry->fClipStack = clipStack;
entry->fClipRegion = clipRegion;
entry->fColor = SkColorSetA(paint.getColor(), 0xFF);
entry->fShaderIndex = -1;
// PDF treats a shader as a color, so we only set one or the other.
SkAutoTUnref<SkPDFObject> pdfShader;
const SkShader* shader = paint.getShader();
SkColor color = paint.getColor();
if (shader) {
// PDF positions patterns relative to the initial transform, so
// we need to apply the current transform to the shader parameters.
SkMatrix transform = matrix;
transform.postConcat(fInitialTransform);
// PDF doesn't support kClamp_TileMode, so we simulate it by making
// a pattern the size of the current clip.
SkIRect bounds = clipRegion.getBounds();
// We need to apply the initial transform to bounds in order to get
// bounds in a consistent coordinate system.
SkRect boundsTemp;
boundsTemp.set(bounds);
fInitialTransform.mapRect(&boundsTemp);
boundsTemp.roundOut(&bounds);
SkScalar rasterScale =
SkIntToScalar(fRasterDpi) / DPI_FOR_RASTER_SCALE_ONE;
pdfShader.reset(SkPDFShader::GetPDFShader(
fCanon, fRasterDpi, *shader, transform, bounds, rasterScale));
if (pdfShader.get()) {
// pdfShader has been canonicalized so we can directly compare
// pointers.
int resourceIndex = fShaderResources.find(pdfShader.get());
if (resourceIndex < 0) {
resourceIndex = fShaderResources.count();
fShaderResources.push(pdfShader.get());
pdfShader.get()->ref();
}
entry->fShaderIndex = resourceIndex;
} else {
// A color shader is treated as an invalid shader so we don't have
// to set a shader just for a color.
SkShader::GradientInfo gradientInfo;
SkColor gradientColor;
gradientInfo.fColors = &gradientColor;
gradientInfo.fColorOffsets = nullptr;
gradientInfo.fColorCount = 1;
if (shader->asAGradient(&gradientInfo) ==
SkShader::kColor_GradientType) {
entry->fColor = SkColorSetA(gradientColor, 0xFF);
color = gradientColor;
}
}
}
SkAutoTUnref<SkPDFGraphicState> newGraphicState;
if (color == paint.getColor()) {
newGraphicState.reset(
SkPDFGraphicState::GetGraphicStateForPaint(fCanon, paint));
} else {
SkPaint newPaint = paint;
newPaint.setColor(color);
newGraphicState.reset(
SkPDFGraphicState::GetGraphicStateForPaint(fCanon, newPaint));
}
int resourceIndex = addGraphicStateResource(newGraphicState.get());
entry->fGraphicStateIndex = resourceIndex;
if (hasText) {
entry->fTextScaleX = paint.getTextScaleX();
entry->fTextFill = paint.getStyle();
} else {
entry->fTextScaleX = 0;
}
}
int SkPDFDevice::addGraphicStateResource(SkPDFObject* gs) {
// Assumes that gs has been canonicalized (so we can directly compare
// pointers).
int result = fGraphicStateResources.find(gs);
if (result < 0) {
result = fGraphicStateResources.count();
fGraphicStateResources.push(gs);
gs->ref();
}
return result;
}
int SkPDFDevice::addXObjectResource(SkPDFObject* xObject) {
// Assumes that xobject has been canonicalized (so we can directly compare
// pointers).
int result = fXObjectResources.find(xObject);
if (result < 0) {
result = fXObjectResources.count();
fXObjectResources.push(xObject);
xObject->ref();
}
return result;
}
void SkPDFDevice::updateFont(const SkPaint& paint, uint16_t glyphID,
ContentEntry* contentEntry) {
SkTypeface* typeface = paint.getTypeface();
if (contentEntry->fState.fFont == nullptr ||
contentEntry->fState.fTextSize != paint.getTextSize() ||
!contentEntry->fState.fFont->hasGlyph(glyphID)) {
int fontIndex = getFontResourceIndex(typeface, glyphID);
contentEntry->fContent.writeText("/");
contentEntry->fContent.writeText(SkPDFResourceDict::getResourceName(
SkPDFResourceDict::kFont_ResourceType,
fontIndex).c_str());
contentEntry->fContent.writeText(" ");
SkPDFUtils::AppendScalar(paint.getTextSize(), &contentEntry->fContent);
contentEntry->fContent.writeText(" Tf\n");
contentEntry->fState.fFont = fFontResources[fontIndex];
}
}
int SkPDFDevice::getFontResourceIndex(SkTypeface* typeface, uint16_t glyphID) {
SkAutoTUnref<SkPDFFont> newFont(
SkPDFFont::GetFontResource(fCanon, typeface, glyphID));
int resourceIndex = fFontResources.find(newFont.get());
if (resourceIndex < 0) {
resourceIndex = fFontResources.count();
fFontResources.push(newFont.get());
newFont.get()->ref();
}
return resourceIndex;
}
static SkSize rect_to_size(const SkRect& r) {
return SkSize::Make(r.width(), r.height());
}
static const SkImage* color_filter(const SkImage* image,
SkColorFilter* colorFilter) {
SkAutoTUnref<SkSurface> surface(SkSurface::NewRaster(
SkImageInfo::MakeN32Premul(image->dimensions())));
if (!surface) {
return image;
}
SkCanvas* canvas = surface->getCanvas();
canvas->clear(SK_ColorTRANSPARENT);
SkPaint paint;
paint.setColorFilter(colorFilter);
canvas->drawImage(image, 0, 0, &paint);
canvas->flush();
return surface->newImageSnapshot();
}
////////////////////////////////////////////////////////////////////////////////
void SkPDFDevice::internalDrawImage(const SkMatrix& origMatrix,
const SkClipStack* clipStack,
const SkRegion& origClipRegion,
const SkImage* image,
const SkIRect* srcRect,
const SkPaint& paint) {
SkASSERT(image);
#ifdef SK_PDF_IMAGE_STATS
gDrawImageCalls.fetch_add(1);
#endif
SkMatrix matrix = origMatrix;
SkRegion perspectiveBounds;
const SkRegion* clipRegion = &origClipRegion;
SkAutoTUnref<const SkImage> autoImageUnref;
if (srcRect) {
autoImageUnref.reset(image->newSubset(*srcRect));
if (!autoImageUnref) {
return;
}
image = autoImageUnref;
}
// Rasterize the bitmap using perspective in a new bitmap.
if (origMatrix.hasPerspective()) {
if (fRasterDpi == 0) {
return;
}
// Transform the bitmap in the new space, without taking into
// account the initial transform.
SkPath perspectiveOutline;
SkRect imageBounds = SkRect::Make(image->bounds());
perspectiveOutline.addRect(imageBounds);
perspectiveOutline.transform(origMatrix);
// TODO(edisonn): perf - use current clip too.
// Retrieve the bounds of the new shape.
SkRect bounds = perspectiveOutline.getBounds();
// Transform the bitmap in the new space, taking into
// account the initial transform.
SkMatrix total = origMatrix;
total.postConcat(fInitialTransform);
SkScalar dpiScale = SkIntToScalar(fRasterDpi) /
SkIntToScalar(DPI_FOR_RASTER_SCALE_ONE);
total.postScale(dpiScale, dpiScale);
SkPath physicalPerspectiveOutline;
physicalPerspectiveOutline.addRect(imageBounds);
physicalPerspectiveOutline.transform(total);
SkRect physicalPerspectiveBounds =
physicalPerspectiveOutline.getBounds();
SkScalar scaleX = physicalPerspectiveBounds.width() / bounds.width();
SkScalar scaleY = physicalPerspectiveBounds.height() / bounds.height();
// TODO(edisonn): A better approach would be to use a bitmap shader
// (in clamp mode) and draw a rect over the entire bounding box. Then
// intersect perspectiveOutline to the clip. That will avoid introducing
// alpha to the image while still giving good behavior at the edge of
// the image. Avoiding alpha will reduce the pdf size and generation
// CPU time some.
SkISize wh = rect_to_size(physicalPerspectiveBounds).toCeil();
SkAutoTUnref<SkSurface> surface(
SkSurface::NewRaster(SkImageInfo::MakeN32Premul(wh)));
if (!surface) {
return;
}
SkCanvas* canvas = surface->getCanvas();
canvas->clear(SK_ColorTRANSPARENT);
SkScalar deltaX = bounds.left();
SkScalar deltaY = bounds.top();
SkMatrix offsetMatrix = origMatrix;
offsetMatrix.postTranslate(-deltaX, -deltaY);
offsetMatrix.postScale(scaleX, scaleY);
// Translate the draw in the new canvas, so we perfectly fit the
// shape in the bitmap.
canvas->setMatrix(offsetMatrix);
canvas->drawImage(image, 0, 0, nullptr);
// Make sure the final bits are in the bitmap.
canvas->flush();
// In the new space, we use the identity matrix translated
// and scaled to reflect DPI.
matrix.setScale(1 / scaleX, 1 / scaleY);
matrix.postTranslate(deltaX, deltaY);
perspectiveBounds.setRect(bounds.roundOut());
clipRegion = &perspectiveBounds;
srcRect = nullptr;
autoImageUnref.reset(surface->newImageSnapshot());
image = autoImageUnref;
}
SkMatrix scaled;
// Adjust for origin flip.
scaled.setScale(SK_Scalar1, -SK_Scalar1);
scaled.postTranslate(0, SK_Scalar1);
// Scale the image up from 1x1 to WxH.
SkIRect subset = image->bounds();
scaled.postScale(SkIntToScalar(image->width()),
SkIntToScalar(image->height()));
scaled.postConcat(matrix);
ScopedContentEntry content(this, clipStack, *clipRegion, scaled, paint);
if (!content.entry() || (srcRect && !subset.intersect(*srcRect))) {
return;
}
if (content.needShape()) {
SkPath shape;
shape.addRect(SkRect::Make(subset));
shape.transform(matrix);
content.setShape(shape);
}
if (!content.needSource()) {
return;
}
if (SkColorFilter* colorFilter = paint.getColorFilter()) {
// TODO(https://bug.skia.org/4378): implement colorfilter on other
// draw calls. This code here works for all
// drawBitmap*()/drawImage*() calls amd ImageFilters (which
// rasterize a layer on this backend). Fortuanely, this seems
// to be how Chromium impements most color-filters.
autoImageUnref.reset(color_filter(image, colorFilter));
image = autoImageUnref;
// TODO(halcanary): de-dupe this by caching filtered images.
// (maybe in the resource cache?)
}
SkAutoTUnref<SkPDFObject> pdfimage(SkSafeRef(fCanon->findPDFBitmap(image)));
if (!pdfimage) {
pdfimage.reset(SkPDFCreateBitmapObject(
image, fCanon->fPixelSerializer));
if (!pdfimage) {
return;
}
fCanon->addPDFBitmap(image->uniqueID(), pdfimage);
}
SkPDFUtils::DrawFormXObject(this->addXObjectResource(pdfimage.get()),
&content.entry()->fContent);
}